Daikin UATYQ25ABAY1, Operation Manual

Page: 18 / 24

Original instructions
Installation manual
18
We reserve the right to make changes without any prior notice.
UATYQ*Y1
Packaged Rooftop
4P522681-1A
CODE DESCRIPTION MAIN CAUSES CHECKS AND TROUBLESHOOTING RESET UNIT
OFF
ITEMS OFF
AL24
B7 probe broken or
disconnected
The reading of the probe B7
(indoor air humidity) exceeds
the range
Check working conditions.
M No
All components
and fuctions
directly related to
the probe
Check in the controller for the correct
probe reading range .
Check the correct reading of the probe
and eventually replace it.
Check probe wiring and terminals.
Check correct functioning of the
analogic input of the main board.
AL25
B4 probe broken or
disconnected
The reading of the probe
B4 (supply air temperature)
exceeds the range
Check working conditions.
M No
All components
and fuctions
directly related to
the probe
Check in the controller for the correct
probe reading range .
Check the correct reading of the probe
and eventually replace it.
Check probe wiring and terminals.
Check correct functioning of the
analogic input of the main board.
AL26
B3 probe broken or
disconnected
The reading of the probe B3
(condensing pressure circuit
1) exceeds the range
Check working conditions.
M No
All components
and fuctions
directly related to
the probe
Check in the controller for the correct
probe reading range .
Check the correct reading of the probe
and eventually replace it.
Check probe wiring and terminals.
Check correct functioning of the
analogic input of the main board.
AL27
B8 probe broken or
disconnected
The reading of the probe B8
(Outdoor air temperature)
exceeds the range
Check working conditions.
M No
All components
and fuctions
directly related to
the probe
Check in the controller for the correct
probe reading range .
Check the correct reading of the probe
and eventually replace it.
Check probe wiring and terminals.
Check correct functioning of the
analogic input of the main board.
AL28
B5 probe broken or
disconnected
The reading of the probe
B5 (return air temperature)
exceeds the range
Check working conditions.
M No
All components
and fuctions
directly related to
the probe
Check in the controller for the correct
probe reading range .
Check the correct reading of the probe
and eventually replace it.
Check probe wiring and terminals.
Check correct functioning of the
analogic input of the main board.
AL29 Heater 1 overload
The circuti breaker of the
heater group 1 trips
Check working conditions (airflow and
temperature).
M No Heater group 1 Check cabling and terminals of the
heaters and adsorbed current.
Check thermal switch.
AL30 Heater 2 overload
The circuit breaker of the
heater group 2 trips
Check working conditions (airflow and
temperature).
M No Heater group 2 Check cabling and terminals of the
heaters and adsorbed current.
Check thermal switch.
AL31
Generic serious
alarm by DIN .
System off
The serious alarm digital
input (DIN) is open
Check external control. M Yes All
AL32
Generic alarm by
dig. input System
still on
The generic alarm digital
input is open
Check extarnal control. M No None